Checking from Behind (AHL and NHL): A forward pushing motion with both hands, palms open, extending from the chest.

Cross-Checking: A forward motion with both fists clenched extending from the chest.

Delayed Calling of a Penalty: The non-whistle hand is extended straight above the head.

Delayed Offsides:
The non-whistle hand is extended straight above the head (NCAA: and the
whistle hand is extended out in front of the chest, forming an "L" with
the non-whistle hand). If play returns to the Neutral Zone without
stoppage, the arm is drawn down the instant the puck crosses the line,
or as soon as the offending team clears the zone.

Delaying the Game (USA Hockey and NCAA): The non-whistle hand, palm open, is placed across the chest and then fully extended directly in front of the body.

Elbowing: Tapping the elbow of the whistle hand with the opposite hand.

Fighting (Roughing): With the non-whistle hand, one punching motion to the side with the arm extending from the shoulder.

Goal Scored:
A single point, with the non-whistle hand, directly at the goal in
which the puck legally entered (USA Hockey and NCAA: while
simultaneously blowing the whistle).

Hand Pass:
The non-whistle hand (open hand) and arm are placed straight down
alongside the body and swung forward and up once in an underhand
motion.

High-Sticking: Holding both fists, clenched, one immediately above the other, at the side of the head.

Holding: Clasping the wrist of the whistle hand well in front of the chest.

Holding/Grabbing the Face Mask: Closed fist held in front of face, palm in, and pulled down in one straight motion.

Hooking: A tugging motion with both arms, as if pulling something toward the stomach.

Icing:
Arms folded across the chest. When the puck is shot or deflected in
such a manner as to produce a possible icing situation, the back
linesman will signal to his partner by raising his non-whistle hand
over his head (NCAA: official's arm raised at a 66 degree angle). The
instant that the conditions required to establish "icing the puck" have
occurred, the front linesman (NCAA: or referee) will blow his whistle
to stop play, and raise his non-whistle hand over his head. The back
official will move to the resulting face-off spot and give the icing
signal.